Looking for no BS info on 8 1/4 rears

As far as Dakota swaps go we had a 69 Charger with an 8 1/4 that was open that we bought a posi unit for, but when we went to swap it the bearings were different sized that what the Charger had in it. We had a 94 4x4 Dakota that had an open rear end in it and with the posi sitting in the garage I figured why not try it. I went to put it in and everything worked fine, but the posi unit didn't have the anti-lock trigger wheel (that trips the magnetic sensor installed in the case), so I couldn't get the right backlash setting because even with the posi unit adjusted all the way to one side in the case it was still howling when I drove it. So I guess the moral is that there may bearing issues and possibly trigger wheel issues between the old and new axles (bigger bearings in the new stuff).